This topic has been discussed many times here, so if you are
interested in exploring what others have said about the language(s)
Jesus spoke, you might want to search in the archives:
http://sunsite.unc.edu/bgreek/archives
I would try keywords like "Aramaic".
I have not searched the archives myself, but I have just read Stanley
Porter's 1996 book "Studies in Biblical Greek", in which he has an
essay on the subject (the whole book is a collection of previously
published works, so I imagine people have seen it elsewhere).
Mari Olsen